crypto/algapi.c

   1 /*
   2  * Cryptographic API for algorithms (i.e., low-level API).
   3  *
   4  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/errno.h>
  15 #include <linux/init.h>
  16 #include <linux/kernel.h>
  17 #include <linux/list.h>
  18 #include <linux/module.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/slab.h>
  21 #include <linux/string.h>
  22
  23 #include "internal.h"
  24
  25 static LIST_HEAD(crypto_template_list);
  26
  27 void crypto_larval_error(const char *name, u32 type, u32 mask)
  28 {
  29         struct crypto_alg *alg;
  30
  31         alg = crypto_alg_lookup(name, type, mask);
  32
  33         if (alg) {
  34                 if (crypto_is_larval(alg)) {
  35                         struct crypto_larval *larval = (void *)alg;
  36                         complete_all(&larval->completion);
  37                 }
  38                 crypto_mod_put(alg);
  39         }
  40 }
  41 EXPORT_SYMBOL_GPL(crypto_larval_error);
  42
  43 static inline int crypto_set_driver_name(struct crypto_alg *alg)
  44 {
  45         static const char suffix[] = "-generic";
  46         char *driver_name = alg->cra_driver_name;
  47         int len;
  48
  49         if (*driver_name)
  50                 return 0;
  51
  52         len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
  53         if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
  54                 return -ENAMETOOLONG;
  55
  56         memcpy(driver_name + len, suffix, sizeof(suffix));
  57         return 0;
  58 }
  59
  60 static int crypto_check_alg(struct crypto_alg *alg)
  61 {
  62         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
  63                 return -EINVAL;
  64
  65         if (alg->cra_blocksize > PAGE_SIZE / 8)
  66                 return -EINVAL;
  67
  68         if (alg->cra_priority < 0)
  69                 return -EINVAL;
  70
  71         return crypto_set_driver_name(alg);
  72 }
  73
  74 static void crypto_destroy_instance(struct crypto_alg *alg)
  75 {
  76         struct crypto_instance *inst = (void *)alg;
  77         struct crypto_template *tmpl = inst->tmpl;
  78
  79         tmpl->free(inst);
  80         crypto_tmpl_put(tmpl);
  81 }
  82
  83 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
  84                                             struct list_head *stack,
  85                                             struct list_head *top,
  86                                             struct list_head *secondary_spawns)
  87 {
  88         struct crypto_spawn *spawn, *n;
  89
  90         if (list_empty(stack))
  91                 return NULL;
  92
  93         spawn = list_first_entry(stack, struct crypto_spawn, list);
  94         n = list_entry(spawn->list.next, struct crypto_spawn, list);
  95
  96         if (spawn->alg && &n->list != stack && !n->alg)
  97                 n->alg = (n->list.next == stack) ? alg :
  98                          &list_entry(n->list.next, struct crypto_spawn,
  99                                      list)->inst->alg;
 100
 101         list_move(&spawn->list, secondary_spawns);
 102
 103         return &n->list == stack ? top : &n->inst->alg.cra_users;
 104 }
 105
 106 static void crypto_remove_spawn(struct crypto_spawn *spawn,
 107                                 struct list_head *list)
 108 {
 109         struct crypto_instance *inst = spawn->inst;
 110         struct crypto_template *tmpl = inst->tmpl;
 111
 112         if (crypto_is_dead(&inst->alg))
 113                 return;
 114
 115         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
 116         if (hlist_unhashed(&inst->list))
 117                 return;
 118
 119         if (!tmpl || !crypto_tmpl_get(tmpl))
 120                 return;
 121
 122         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
 123         list_move(&inst->alg.cra_list, list);
 124         hlist_del(&inst->list);
 125         inst->alg.cra_destroy = crypto_destroy_instance;
 126
 127         BUG_ON(!list_empty(&inst->alg.cra_users));
 128 }
 129
 130 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 131                           struct crypto_alg *nalg)
 132 {
 133         u32 new_type = (nalg ?: alg)->cra_flags;
 134         struct crypto_spawn *spawn, *n;
 135         LIST_HEAD(secondary_spawns);
 136         struct list_head *spawns;
 137         LIST_HEAD(stack);
 138         LIST_HEAD(top);
 139
 140         spawns = &alg->cra_users;
 141         list_for_each_entry_safe(spawn, n, spawns, list) {
 142                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 143                         continue;
 144
 145                 list_move(&spawn->list, &top);
 146         }
 147
 148         spawns = &top;
 149         do {
 150                 while (!list_empty(spawns)) {
 151                         struct crypto_instance *inst;
 152
 153                         spawn = list_first_entry(spawns, struct crypto_spawn,
 154                                                  list);
 155                         inst = spawn->inst;
 156
 157                         BUG_ON(&inst->alg == alg);
 158
 159                         list_move(&spawn->list, &stack);
 160
 161                         if (&inst->alg == nalg)
 162                                 break;
 163
 164                         spawn->alg = NULL;
 165                         spawns = &inst->alg.cra_users;
 166
 167                         /*
 168                          * We may encounter an unregistered instance here, since
 169                          * an instance's spawns are set up prior to the instance
 170                          * being registered.  An unregistered instance will have
 171                          * NULL ->cra_users.next, since ->cra_users isn't
 172                          * properly initialized until registration.  But an
 173                          * unregistered instance cannot have any users, so treat
 174                          * it the same as ->cra_users being empty.
 175                          */
 176                         if (spawns->next == NULL)
 177                                 break;
 178                 }
 179         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
 180                                               &secondary_spawns)));
 181
 182         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
 183                 if (spawn->alg)
 184                         list_move(&spawn->list, &spawn->alg->cra_users);
 185                 else
 186                         crypto_remove_spawn(spawn, list);
 187         }
 188 }
 189 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 190
 191 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 192 {
 193         struct crypto_alg *q;
 194         struct crypto_larval *larval;
 195         int ret = -EAGAIN;
 196
 197         if (crypto_is_dead(alg))
 198                 goto err;
 199
 200         INIT_LIST_HEAD(&alg->cra_users);
 201
 202         /* No cheating! */
 203         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 204
 205         ret = -EEXIST;
 206
 207         atomic_set(&alg->cra_refcnt, 1);
 208         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 209                 if (q == alg)
 210                         goto err;
 211
 212                 if (crypto_is_moribund(q))
 213                         continue;
 214
 215                 if (crypto_is_larval(q)) {
 216                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 217                                 goto err;
 218                         continue;
 219                 }
 220
 221                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 222                     !strcmp(q->cra_name, alg->cra_driver_name))
 223                         goto err;
 224         }
 225
 226         larval = crypto_larval_alloc(alg->cra_name,
 227                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 228         if (IS_ERR(larval))
 229                 goto out;
 230
 231         ret = -ENOENT;
 232         larval->adult = crypto_mod_get(alg);
 233         if (!larval->adult)
 234                 goto free_larval;
 235
 236         atomic_set(&larval->alg.cra_refcnt, 1);
 237         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 238                CRYPTO_MAX_ALG_NAME);
 239         larval->alg.cra_priority = alg->cra_priority;
 240
 241         list_add(&alg->cra_list, &crypto_alg_list);
 242         list_add(&larval->alg.cra_list, &crypto_alg_list);
 243
 244 out:
 245         return larval;
 246
 247 free_larval:
 248         kfree(larval);
 249 err:
 250         larval = ERR_PTR(ret);
 251         goto out;
 252 }
 253
 254 void crypto_alg_tested(const char *name, int err)
 255 {
 256         struct crypto_larval *test;
 257         struct crypto_alg *alg;
 258         struct crypto_alg *q;
 259         LIST_HEAD(list);
 260
 261         down_write(&crypto_alg_sem);
 262         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 263                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 264                         continue;
 265
 266                 test = (struct crypto_larval *)q;
 267
 268                 if (!strcmp(q->cra_driver_name, name))
 269                         goto found;
 270         }
 271
 272         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
 273         goto unlock;
 274
 275 found:
 276         q->cra_flags |= CRYPTO_ALG_DEAD;
 277         alg = test->adult;
 278         if (err || list_empty(&alg->cra_list))
 279                 goto complete;
 280
 281         alg->cra_flags |= CRYPTO_ALG_TESTED;
 282
 283         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 284                 if (q == alg)
 285                         continue;
 286
 287                 if (crypto_is_moribund(q))
 288                         continue;
 289
 290                 if (crypto_is_larval(q)) {
 291                         struct crypto_larval *larval = (void *)q;
 292
 293                         /*
 294                          * Check to see if either our generic name or
 295                          * specific name can satisfy the name requested
 296                          * by the larval entry q.
 297                          */
 298                         if (strcmp(alg->cra_name, q->cra_name) &&
 299                             strcmp(alg->cra_driver_name, q->cra_name))
 300                                 continue;
 301
 302                         if (larval->adult)
 303                                 continue;
 304                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 305                                 continue;
 306                         if (!crypto_mod_get(alg))
 307                                 continue;
 308
 309                         larval->adult = alg;
 310                         complete_all(&larval->completion);
 311                         continue;
 312                 }
 313
 314                 if (strcmp(alg->cra_name, q->cra_name))
 315                         continue;
 316
 317                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 318                     q->cra_priority > alg->cra_priority)
 319                         continue;
 320
 321                 crypto_remove_spawns(q, &list, alg);
 322         }
 323
 324 complete:
 325         complete_all(&test->completion);
 326
 327 unlock:
 328         up_write(&crypto_alg_sem);
 329
 330         crypto_remove_final(&list);
 331 }
 332 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 333
 334 void crypto_remove_final(struct list_head *list)
 335 {
 336         struct crypto_alg *alg;
 337         struct crypto_alg *n;
 338
 339         list_for_each_entry_safe(alg, n, list, cra_list) {
 340                 list_del_init(&alg->cra_list);
 341                 crypto_alg_put(alg);
 342         }
 343 }
 344 EXPORT_SYMBOL_GPL(crypto_remove_final);
 345
 346 static void crypto_wait_for_test(struct crypto_larval *larval)
 347 {
 348         int err;
 349
 350         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 351         if (err != NOTIFY_STOP) {
 352                 if (WARN_ON(err != NOTIFY_DONE))
 353                         goto out;
 354                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 355         }
 356
 357         err = wait_for_completion_killable(&larval->completion);
 358         WARN_ON(err);
 359
 360 out:
 361         crypto_larval_kill(&larval->alg);
 362 }
 363
 364 int crypto_register_alg(struct crypto_alg *alg)
 365 {
 366         struct crypto_larval *larval;
 367         int err;
 368
 369         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
 370         err = crypto_check_alg(alg);
 371         if (err)
 372                 return err;
 373
 374         down_write(&crypto_alg_sem);
 375         larval = __crypto_register_alg(alg);
 376         up_write(&crypto_alg_sem);
 377
 378         if (IS_ERR(larval))
 379                 return PTR_ERR(larval);
 380
 381         crypto_wait_for_test(larval);
 382         return 0;
 383 }
 384 EXPORT_SYMBOL_GPL(crypto_register_alg);
 385
 386 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 387 {
 388         if (unlikely(list_empty(&alg->cra_list)))
 389                 return -ENOENT;
 390
 391         alg->cra_flags |= CRYPTO_ALG_DEAD;
 392
 393         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
 394         list_del_init(&alg->cra_list);
 395         crypto_remove_spawns(alg, list, NULL);
 396
 397         return 0;
 398 }
 399
 400 int crypto_unregister_alg(struct crypto_alg *alg)
 401 {
 402         int ret;
 403         LIST_HEAD(list);
 404
 405         down_write(&crypto_alg_sem);
 406         ret = crypto_remove_alg(alg, &list);
 407         up_write(&crypto_alg_sem);
 408
 409         if (ret)
 410                 return ret;
 411
 412         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 413         if (alg->cra_destroy)
 414                 alg->cra_destroy(alg);
 415
 416         crypto_remove_final(&list);
 417         return 0;
 418 }
 419 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 420
 421 int crypto_register_template(struct crypto_template *tmpl)
 422 {
 423         struct crypto_template *q;
 424         int err = -EEXIST;
 425
 426         down_write(&crypto_alg_sem);
 427
 428         list_for_each_entry(q, &crypto_template_list, list) {
 429                 if (q == tmpl)
 430                         goto out;
 431         }
 432
 433         list_add(&tmpl->list, &crypto_template_list);
 434         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
 435         err = 0;
 436 out:
 437         up_write(&crypto_alg_sem);
 438         return err;
 439 }
 440 EXPORT_SYMBOL_GPL(crypto_register_template);
 441
 442 void crypto_unregister_template(struct crypto_template *tmpl)
 443 {
 444         struct crypto_instance *inst;
 445         struct hlist_node *p, *n;
 446         struct hlist_head *list;
 447         LIST_HEAD(users);
 448
 449         down_write(&crypto_alg_sem);
 450
 451         BUG_ON(list_empty(&tmpl->list));
 452         list_del_init(&tmpl->list);
 453
 454         list = &tmpl->instances;
 455         hlist_for_each_entry(inst, p, list, list) {
 456                 int err = crypto_remove_alg(&inst->alg, &users);
 457                 BUG_ON(err);
 458         }
 459
 460         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
 461
 462         up_write(&crypto_alg_sem);
 463
 464         hlist_for_each_entry_safe(inst, p, n, list, list) {
 465                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
 466                 tmpl->free(inst);
 467         }
 468         crypto_remove_final(&users);
 469 }
 470 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 471
 472 static struct crypto_template *__crypto_lookup_template(const char *name)
 473 {
 474         struct crypto_template *q, *tmpl = NULL;
 475
 476         down_read(&crypto_alg_sem);
 477         list_for_each_entry(q, &crypto_template_list, list) {
 478                 if (strcmp(q->name, name))
 479                         continue;
 480                 if (unlikely(!crypto_tmpl_get(q)))
 481                         continue;
 482
 483                 tmpl = q;
 484                 break;
 485         }
 486         up_read(&crypto_alg_sem);
 487
 488         return tmpl;
 489 }
 490
 491 struct crypto_template *crypto_lookup_template(const char *name)
 492 {
 493         return try_then_request_module(__crypto_lookup_template(name),
 494                                        "crypto-%s", name);
 495 }
 496 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 497
 498 int crypto_register_instance(struct crypto_template *tmpl,
 499                              struct crypto_instance *inst)
 500 {
 501         struct crypto_larval *larval;
 502         int err;
 503
 504         err = crypto_check_alg(&inst->alg);
 505         if (err)
 506                 goto err;
 507
 508         inst->alg.cra_module = tmpl->module;
 509         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 510
 511         down_write(&crypto_alg_sem);
 512
 513         larval = __crypto_register_alg(&inst->alg);
 514         if (IS_ERR(larval))
 515                 goto unlock;
 516
 517         hlist_add_head(&inst->list, &tmpl->instances);
 518         inst->tmpl = tmpl;
 519
 520 unlock:
 521         up_write(&crypto_alg_sem);
 522
 523         err = PTR_ERR(larval);
 524         if (IS_ERR(larval))
 525                 goto err;
 526
 527         crypto_wait_for_test(larval);
 528         err = 0;
 529
 530 err:
 531         return err;
 532 }
 533 EXPORT_SYMBOL_GPL(crypto_register_instance);
 534
 535 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 536                       struct crypto_instance *inst, u32 mask)
 537 {
 538         int err = -EAGAIN;
 539
 540         spawn->inst = inst;
 541         spawn->mask = mask;
 542
 543         down_write(&crypto_alg_sem);
 544         if (!crypto_is_moribund(alg)) {
 545                 list_add(&spawn->list, &alg->cra_users);
 546                 spawn->alg = alg;
 547                 err = 0;
 548         }
 549         up_write(&crypto_alg_sem);
 550
 551         return err;
 552 }
 553 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 554
 555 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 556                        struct crypto_instance *inst,
 557                        const struct crypto_type *frontend)
 558 {
 559         int err = -EINVAL;
 560
 561         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 562                 goto out;
 563
 564         spawn->frontend = frontend;
 565         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 566
 567 out:
 568         return err;
 569 }
 570 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 571
 572 void crypto_drop_spawn(struct crypto_spawn *spawn)
 573 {
 574         if (!spawn->alg)
 575                 return;
 576
 577         down_write(&crypto_alg_sem);
 578         list_del(&spawn->list);
 579         up_write(&crypto_alg_sem);
 580 }
 581 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 582
 583 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 584 {
 585         struct crypto_alg *alg;
 586         struct crypto_alg *alg2;
 587
 588         down_read(&crypto_alg_sem);
 589         alg = spawn->alg;
 590         alg2 = alg;
 591         if (alg2)
 592                 alg2 = crypto_mod_get(alg2);
 593         up_read(&crypto_alg_sem);
 594
 595         if (!alg2) {
 596                 if (alg)
 597                         crypto_shoot_alg(alg);
 598                 return ERR_PTR(-EAGAIN);
 599         }
 600
 601         return alg;
 602 }
 603
 604 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 605                                     u32 mask)
 606 {
 607         struct crypto_alg *alg;
 608         struct crypto_tfm *tfm;
 609
 610         alg = crypto_spawn_alg(spawn);
 611         if (IS_ERR(alg))
 612                 return ERR_CAST(alg);
 613
 614         tfm = ERR_PTR(-EINVAL);
 615         if (unlikely((alg->cra_flags ^ type) & mask))
 616                 goto out_put_alg;
 617
 618         tfm = __crypto_alloc_tfm(alg, type, mask);
 619         if (IS_ERR(tfm))
 620                 goto out_put_alg;
 621
 622         return tfm;
 623
 624 out_put_alg:
 625         crypto_mod_put(alg);
 626         return tfm;
 627 }
 628 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 629
 630 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 631 {
 632         struct crypto_alg *alg;
 633         struct crypto_tfm *tfm;
 634
 635         alg = crypto_spawn_alg(spawn);
 636         if (IS_ERR(alg))
 637                 return ERR_CAST(alg);
 638
 639         tfm = crypto_create_tfm(alg, spawn->frontend);
 640         if (IS_ERR(tfm))
 641                 goto out_put_alg;
 642
 643         return tfm;
 644
 645 out_put_alg:
 646         crypto_mod_put(alg);
 647         return tfm;
 648 }
 649 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 650
 651 int crypto_register_notifier(struct notifier_block *nb)
 652 {
 653         return blocking_notifier_chain_register(&crypto_chain, nb);
 654 }
 655 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 656
 657 int crypto_unregister_notifier(struct notifier_block *nb)
 658 {
 659         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 660 }
 661 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 662
 663 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 664 {
 665         struct rtattr *rta = tb[0];
 666         struct crypto_attr_type *algt;
 667
 668         if (!rta)
 669                 return ERR_PTR(-ENOENT);
 670         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 671                 return ERR_PTR(-EINVAL);
 672         if (rta->rta_type != CRYPTOA_TYPE)
 673                 return ERR_PTR(-EINVAL);
 674
 675         algt = RTA_DATA(rta);
 676
 677         return algt;
 678 }
 679 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 680
 681 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 682 {
 683         struct crypto_attr_type *algt;
 684
 685         algt = crypto_get_attr_type(tb);
 686         if (IS_ERR(algt))
 687                 return PTR_ERR(algt);
 688
 689         if ((algt->type ^ type) & algt->mask)
 690                 return -EINVAL;
 691
 692         return 0;
 693 }
 694 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 695
 696 const char *crypto_attr_alg_name(struct rtattr *rta)
 697 {
 698         struct crypto_attr_alg *alga;
 699
 700         if (!rta)
 701                 return ERR_PTR(-ENOENT);
 702         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 703                 return ERR_PTR(-EINVAL);
 704         if (rta->rta_type != CRYPTOA_ALG)
 705                 return ERR_PTR(-EINVAL);
 706
 707         alga = RTA_DATA(rta);
 708         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 709
 710         return alga->name;
 711 }
 712 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 713
 714 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 715                                     const struct crypto_type *frontend,
 716                                     u32 type, u32 mask)
 717 {
 718         const char *name;
 719         int err;
 720
 721         name = crypto_attr_alg_name(rta);
 722         err = PTR_ERR(name);
 723         if (IS_ERR(name))
 724                 return ERR_PTR(err);
 725
 726         return crypto_find_alg(name, frontend, type, mask);
 727 }
 728 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 729
 730 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 731 {
 732         struct crypto_attr_u32 *nu32;
 733
 734         if (!rta)
 735                 return -ENOENT;
 736         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 737                 return -EINVAL;
 738         if (rta->rta_type != CRYPTOA_U32)
 739                 return -EINVAL;
 740
 741         nu32 = RTA_DATA(rta);
 742         *num = nu32->num;
 743
 744         return 0;
 745 }
 746 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 747
 748 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 749                              unsigned int head)
 750 {
 751         struct crypto_instance *inst;
 752         char *p;
 753         int err;
 754
 755         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 756                     GFP_KERNEL);
 757         if (!p)
 758                 return ERR_PTR(-ENOMEM);
 759
 760         inst = (void *)(p + head);
 761
 762         err = -ENAMETOOLONG;
 763         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 764                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 765                 goto err_free_inst;
 766
 767         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 768                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 769                 goto err_free_inst;
 770
 771         return p;
 772
 773 err_free_inst:
 774         kfree(p);
 775         return ERR_PTR(err);
 776 }
 777 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 778
 779 struct crypto_instance *crypto_alloc_instance(const char *name,
 780                                               struct crypto_alg *alg)
 781 {
 782         struct crypto_instance *inst;
 783         struct crypto_spawn *spawn;
 784         int err;
 785
 786         inst = crypto_alloc_instance2(name, alg, 0);
 787         if (IS_ERR(inst))
 788                 goto out;
 789
 790         spawn = crypto_instance_ctx(inst);
 791         err = crypto_init_spawn(spawn, alg, inst,
 792                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 793
 794         if (err)
 795                 goto err_free_inst;
 796
 797         return inst;
 798
 799 err_free_inst:
 800         kfree(inst);
 801         inst = ERR_PTR(err);
 802
 803 out:
 804         return inst;
 805 }
 806 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 807
 808 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 809 {
 810         INIT_LIST_HEAD(&queue->list);
 811         queue->backlog = &queue->list;
 812         queue->qlen = 0;
 813         queue->max_qlen = max_qlen;
 814 }
 815 EXPORT_SYMBOL_GPL(crypto_init_queue);
 816
 817 int crypto_enqueue_request(struct crypto_queue *queue,
 818                            struct crypto_async_request *request)
 819 {
 820         int err = -EINPROGRESS;
 821
 822         if (unlikely(queue->qlen >= queue->max_qlen)) {
 823                 err = -EBUSY;
 824                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
 825                         goto out;
 826                 if (queue->backlog == &queue->list)
 827                         queue->backlog = &request->list;
 828         }
 829
 830         queue->qlen++;
 831         list_add_tail(&request->list, &queue->list);
 832
 833 out:
 834         return err;
 835 }
 836 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 837
 838 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
 839 {
 840         struct list_head *request;
 841
 842         if (unlikely(!queue->qlen))
 843                 return NULL;
 844
 845         queue->qlen--;
 846
 847         if (queue->backlog != &queue->list)
 848                 queue->backlog = queue->backlog->next;
 849
 850         request = queue->list.next;
 851         list_del(request);
 852
 853         return (char *)list_entry(request, struct crypto_async_request, list) -
 854                offset;
 855 }
 856 EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
 857
 858 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 859 {
 860         return __crypto_dequeue_request(queue, 0);
 861 }
 862 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 863
 864 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 865 {
 866         struct crypto_async_request *req;
 867
 868         list_for_each_entry(req, &queue->list, list) {
 869                 if (req->tfm == tfm)
 870                         return 1;
 871         }
 872
 873         return 0;
 874 }
 875 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 876
 877 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 878 {
 879         u8 *b = (a + size);
 880         u8 c;
 881
 882         for (; size; size--) {
 883                 c = *--b + 1;
 884                 *b = c;
 885                 if (c)
 886                         break;
 887         }
 888 }
 889
 890 void crypto_inc(u8 *a, unsigned int size)
 891 {
 892         __be32 *b = (__be32 *)(a + size);
 893         u32 c;
 894
 895         for (; size >= 4; size -= 4) {
 896                 c = be32_to_cpu(*--b) + 1;
 897                 *b = cpu_to_be32(c);
 898                 if (c)
 899                         return;
 900         }
 901
 902         crypto_inc_byte(a, size);
 903 }
 904 EXPORT_SYMBOL_GPL(crypto_inc);
 905
 906 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
 907 {
 908         for (; size; size--)
 909                 *a++ ^= *b++;
 910 }
 911
 912 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 913 {
 914         u32 *a = (u32 *)dst;
 915         u32 *b = (u32 *)src;
 916
 917         for (; size >= 4; size -= 4)
 918                 *a++ ^= *b++;
 919
 920         crypto_xor_byte((u8 *)a, (u8 *)b, size);
 921 }
 922 EXPORT_SYMBOL_GPL(crypto_xor);
 923
 924 static int __init crypto_algapi_init(void)
 925 {
 926         crypto_init_proc();
 927         return 0;
 928 }
 929
 930 static void __exit crypto_algapi_exit(void)
 931 {
 932         crypto_exit_proc();
 933 }
 934
 935 module_init(crypto_algapi_init);
 936 module_exit(crypto_algapi_exit);
 937
 938 MODULE_LICENSE("GPL");
 939 MODULE_DESCRIPTION("Cryptographic algorithms API");